supercell(redirected from Supertornado)
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A severe, usually isolated thunderstorm characterized by a strong rotating updraft and often giving rise to damaging winds, electrical storms, flooding, large hail, and tornadoes.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.